Farmall 90 Manual page 23

Problems
Engine produces excessive
black or dark grey smoke.
Blue, grey- -blue or grey- -
white smoke.
Engine runs on after
switching off.
SECTION 10 - - ENGINE - - CHAPTER 1
TROUBLESHOOTING (continued)
Possible Causes
1. Maximum delivery of injection
pump too high.
2. Injection pump delivery exces-
sively retarded or automatic ad-
vance regulator damaged.
3. Injection pump delivery exces-
sively advanced.
4. Injectors partially or totally ob-
structed or incorrectly adjusted.
5. Air filter clogged.
6. Loss of engine compression due
to:
-- piston rings sticking;
-- cylinder liner wear;
-- worn or incorrectly adjusted
valves.
7. High--pressure fuel lines dam-
aged.
1. Injection pump delivery excess-
ively retarded or automatic ad-
vance regulator damaged.
2. Injectors obstructed or damaged. Clean, overhaul and calibrate injec-
3. Oil leaking past piston rings due
to sticking rings or cylinder liner
wear.
4. Oil leaking through the inlet valve
guides due to guide or valve stem
wear.
5. Engine does not reach correct
operating temperature (thermo-
stat faulty).
1. Engine stop electromagnet dam-
aged.
2. All--speed governor damaged.
Solutions
Calibrate pump on test bench to val-
ues specified in calibration tables.
Adjust injection pump timing or check
automatic advance regulator.
Adjust injection pump timing.
Clean and overhaul injectors and ad-
just pressure setting; replace if
necessary.
Clean filter unit and replace filter el-
ement if necessary.
Replace damaged parts or, if necess-
ary, overhaul the engine.
Inspect and replace if necessary.
Adjust injection pump timing or check
automatic advance regulator.
tors, replace if necessary.
Replace damaged parts or, if necess-
ary, overhaul the engine.
Overhaul cylinder head.
Replace the thermostat.
Replace electromagnet.
Overhaul injection pump and adjust
on test bench to values specified in
calibration table.
23